package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {


    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    //新增菜品
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        //属性拷贝
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入1条数据
        dishMapper.insert(dish);

        //获取新增菜品的id
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && !flavors.isEmpty()){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //批量向菜品口味表插入数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    //菜品分页查询
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {

        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());

    }

    //删除菜品
    @Transactional//事务
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品？？
        for (Long id : ids) {
            //根据菜品id查询菜品数据
            Dish dish = dishMapper.getById(id);//后续修改菜品有回显功能
            if(dish.getStatus() == StatusConstant.ENABLE){
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);//BaseException的子类异常
            }
        }
        //判断当前菜品是否能够删除---是否被套餐关联了？？
        List<Long> setmealIdsByDishIds = setmealDishMapper.getSetmealIdsByDishIds(ids);//根据菜品id查询对应的套餐id
        if(setmealIdsByDishIds != null && !setmealIdsByDishIds.isEmpty()){
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品数据
        for (Long id : ids) {
            //删除菜品数据
            dishMapper.deleteById(id);
            //删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }
    }

    //修改菜品
    //1.根据id查询菜品和对应的口味数据
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByFlavor(id);

        //将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    //2.修改菜品实现
    @Override
    public void updateWithFlavor(DishDTO dishDTO){
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表基本信息
        dishMapper.update(dish);
        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        //flavors != null检查集合对象是否被初始化（已经被创建并分配了内存空间)，
        // 而!flavors.isEmpty()或flavors.size() > 0检查集合中是否有元素。
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    //根据分类id查询菜品
    @Override
    public List<Dish> listByCategoryId(Long categoryId) {
        Dish dish = Dish.builder().categoryId(categoryId)
                .status(StatusConstant.ENABLE).build();
        return dishMapper.list(dish);
    }
    //菜品起售停售
    @Override
    public void updateStatus(Integer status, Long id) {

        //如果是停售操作，还需要将包含当前菜品的套餐也停售
        if(status == StatusConstant.DISABLE){
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();

            dishIds.add(id);
            //调用此方法的参数是一个集合，所以需要将id封装到集合中
            List<Long> setmealIdsByDishIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if(setmealIdsByDishIds != null && !setmealIdsByDishIds.isEmpty()){
                for (Long setmealIdsByDishId : setmealIdsByDishIds) {
                    Setmeal setmeal = Setmeal.builder().id(setmealIdsByDishId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
        //修改菜品状态
        Dish dish = Dish.builder()
                .id(id).status(status).build();
        dishMapper.update(dish);

    }

    //条件查询菜品和口味
    public List<DishVO> listWithFlavor(Dish dish) {
        //根据条件查询菜品数据
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味 return setmealMapper.getDishItemBySetmealId(id);
            //    }
            List<DishFlavor> flavors = dishFlavorMapper.getByFlavor(d.getId());

            //将查询到的数据封装到VO
            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
